Lathe.



W. A McELROY.

LATHE.

APPLICATION men JUNE 22. 1914.

Patented Apr. 13,1915.

3 SHEETS-SHEET 1* THE NORRIS PETERS CO4, PHOTG-LITHO., WASHINGTDN. D. C.

w. A. McELROY.

LATHE.

APPLICATION FILED JUNE 22. 1914. M Patented Apr. 13, 1915.

' 3 SHEETS-SHEET 9 7 "5% g I/ 0 2; 3i 9 AIM/2* J49 Inventor THE NORRIS PETERs-CO PHOTOYLITHQ. WASHINGTON. D. C.

W. A.- McELROY LATHE. APPLICATION FILED JUNE 22. .I9I4.

Patented Apr. 13, 1915.

1 9 L ALAN i) m 3 SHEETS-SHEET 3.

Attorney;

0. PHOTO-LITH Zv WASHINGTON, D. C. v

WYLIE A. MGELROY, OF ATLANTA, GEORGIA.

LATHE.

Specification of Letters Patent.

Patented Apr. 13, 1915.

Application filed June 22, 1914. Serial No. 846,628.

To all whom it may concern:

Be it known that I, WYLIE A. MOELROY, a citizen of the United States, residing at Atlanta, in the county of Fulton and State of Georgia, have invented a new and use ful Lathe, of which the following is a specification.

The device forming the subject matter of this application is a lathe, adapted to be employed in turning out objects of irregular shapes, such as wooden legs.

One object of the present invention is to provide a device of this type which w1ll not only shape the leg eXteriorly but, as well, shape the interior cavity of the leg.

Another object of the invention is to provide in a device of the type above descr1bed, means whereby the thickness of the wall of the leg may be varied at will.

it is within the scope of the invention to improve generally and to enhance the utility of the devices of that type to which the present invention appertains.

With the above andother objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings :-Figure 1 shows the invention in side elevation parts being sectioned; Fig. 2 is an end elevation of the basket, the auxiliary spider being applied thereto; Fig. 3 is a fragmental longitudinal section of the basket showing the auxiliary spider in place; Figs. 4: and 5 are elevations showing opposite ends of the machine; Fig. 6 is a detail showing a portion of the driving mechanism; Fig. 7 is a fragmental elevation showing the separable nut whereby the tool carriage is operatively connected with the lead screw. Fig. 8 is a sectional detail showing one of the bearings; Fig. 9 is a horizontal section on the line 99 of Fig. 1.

In the accompanying drawings there is shown a frame 1 of any desired construction, upon which is mounted for horizontal adjustment, a base plate 100, the base plate 100 being pivoted to the frame 1 as shown at 101. Pivotally supported upon the frame 1 is an ang e b a ket 102, the pivot of the angle bracket being indicated at 103. Threaded into the angle bracket 102 and opcratively connected with the base plate 1.00 is a screw 101. By operating the screw 104;, the base plate 100 may be moved horizontally with the pivot element 101 as a center, the pivot element 101-being located as may be found expedient and necessary. The base plate 100 is provided with transverse guides 2 upon which is mounted for adjustment, transversely of the frame 1, a basket carriage 3. The basket carriage 3 is moved transversely of the frame 1 through the instrumentality of a feed screw 1 forming an operative connection between a lug 5 on the base plate 100 and a lug 6 on the basket carriage 3.

The basket carriage 3 is a composite structure and comprises parts 7 and 8 held together by bolts 9 or in any other suitable manner, the parts 7 and S of the basket carriage 3 serving to support for rotation, the basket 18, to be described in detail hereinafter. Located above the basket carriage 3 is a model carriage 10 comprising arms 11. Journaled in one of the arms 11 is a driven spindle 1.2, receiving one endof the model 14:, the other end of the model 14L being engaged by a center 15 threaded into the other arm 11 and controlled by means of a hand wheel 16. The model carriage 10 slides transversely of the frame 1 upon guides 10 constituting a part of the top of the basket carriage'3. A feed screw 17 is employed for producing relative movement between the model carriage 10 and the basket carriage 3.

The basket which holds the piece of ma terial out of which the artificial leg is formed, is denoted generally by the numeral 18 and is journaled in the cooperating parts 7 and 8 of the basket carriage 3. The basket 18 comprises 7 rims 20. At the right hand end of the carriage, the rim 20 is connected by means of spokes 19 with a hub 23. At the left hand end of the basket the same is devoid of spokes and is open, as shown best in Fig. 10. Slats 21 extend between the rims 20" and are provided with openings 21 adapted to receive screws 22 or the like which serve under some circumstances to hold in place the material out of which the wooden leg 31 is to be turned.

Journaled in the hub 23 is a spindle 2 1. At times, as will be pointed out hereinafter, this spindle serves '50 hold one end of the turned out.

.31; While the same is being The other end of the wooden wooden leg leg is held in place by a head 30 journaled on the inner end of the screw 28 provided with a'handle ,,tlie screw 28 being threaded into a bearing 27 constituting a part of A a spider 25 which may be attached by means Tend of the basket is devoid of spokes, the '7 spokes being part of the spider.

Noting particularly Fig. it will be seen that 5 a; pinion 32 is attached to the right hand end of the driven spindle 12 in the model carriage 10. Secured to the end of V the spindle 24 of the basket is a pinion 33.

A longitudinally extensible shaft 34 is provided, this shaft 34 being equipped at its upper end with a worm'35 which meshes into the pinion 32. The worm 35*is held in mesh with the pinion 32 by means of a yoke 36 mounted on the shaft 34. Through the in- J strumentality of a universal'joint 37, the

, shaft 34 is connected with a shaft '38 carrying a worm 39which meshes into the pinion 33, these parts being held in operative connection by mean's of a yoke 40 on the shaft 38." Bymeans of auni'versal joint 41, the lower'end of the shaft 38 is connected with 1 a shaft42 journaled for rotation in a bearing 43 supported by brackets .43 on the machine frame atone-end thereof; The shaft 42 carries, as shown in Fig. 6, apinion 43 meshing Zintoaworm 44 carried by a short shafts45 journaled in a bearing 45 on. the frame ofthe'machine.

The basket spindle 24 may be connected toy and disconnected from the hub 23 of the 40 basket through the medium of a clutch 46 controlled by a lever 47 fulcrumed on the (basket carriage 3 and adapted-to be engaged by, a keeper '48 on the basket carriage.

' "The shaft '45 is driven by a mechanism to be described hereinafter but atthis point it p may be stated that through the medium of the'shafts 45,38 and 34 the model spindle 12 is rotated, the shafts45 and 38-co6perating to rotate the spindle'24, or the spindle 24 and the basket 18 provided that the spindle 24 is coupled to the hub 23 ofthe basket by the clutch46. Since the shafts 34 and 38 5 are longitudinally extensible, the basket carriage 3 and the model carriage 10 ,may be moved transversely ofthe main frame of the machine.

The invention includes a tool carriage denoted generally' by. the numeral 49 and mounted ,to reciprocate on the machine ciprocation of the basket carriage 3 and the model carriage 10. The tool carriage 49 is actuated "through the medium of a lead frame'l, at right angles to the line of re- 7 52, shown best in Fig. 7, the constituent portions of the split nut 52 being separable, and being held on the tool carriage 49 for movement at right angles to the axis of the lead screw 50. Any suitable means may be provided for clamping the constituent parts of the nut 52 onto the lead screw 50 and if desired, portions of the constituent parts of the nut 52 may be engaged by a cam ring 53 actuated by a handle 54.

The tool carriage 49 of the machine in cludes an upright post 55 having forwardly projecting arms 56. A face plate 57 is provided, the same being equipped as shown in Fig. 4, with rear extensions 58, the extensions 58 being pivoted to the arms 56 through the medium of screws 59 or the like. The upper end of the face plate 57 is provided with a bearing 60 into which is inserted a longitudinally adjustable arm 61. Thebearing 60, as shown in Fig. 1, comprises two parts and between these parts of the bearing a lock nut 62 is threaded onto the arm 61, the arm 61 being terminally provided with a lock nut 63 bearing against the end of one of the parts of the bearing 60. At its free end, the arm 61 is provided with a roller 64 adapted to traverse the model 14.

At the lower end of the face plate 57 there is formed a bearing 65. Threaded as shown at 107 into the end of the bearing 65 is a tubular arm 66, the bore of which is tapered at one end as shown at 108. Journaled in the bearing 65 and in the arm 66 is a shaft 67 tapered as shown at 109 to coiiperate with the tapered portion 108 of the bore of the tubular arm 66. The exposed end of the shaft 67 carries a cutter 68. The shaft 67 is provided with a longitudinal slot 120 receiving a rib or key 121 on a pulley 81 located between'the constituent portions of the bearing 65.. At its rear end, the shaft 67 is pointed as shown at 122, tocoiiperate withja thrust bearing 123 threaded into the member 65 and held in place by a set nut 124. By advancing the thrust bearing 123, any wear occuring in the shaft 67 may be taken up, attention being directed specifically to the cotiperation between thetapered portions 108 and 109 ofthe arm 66 and the shaft 67 respectively.

v A spring 69, shown in Fig. 4 abuts against the face plate 57 and the arm 55 to one side of the pivot element 59, the function of the spring 69'being to swing the face plate 57 and the arms 66 and 61 so that the roller 64 is maintained in engagement with the model 14, the cutter 68 being maintained in en- 7 with a rack 70 adapted to be engaged by a" pinion 71 journaled on the tool carriage, the

pinion 71 meshing into a pinion 7 2 secured to a shaft 73 journaled in the tool carriage, the shaft 73 being actuated by a hand wheel 74.

Journaled on the machine frame 1 adjacent the lower, rear side thereof is a shaft 75 carrying a pulley 7 6 connected by means of a belt 7 6 with a pulley 77 mounted on a frame supported shaft 78. Splined at 110 to the shaft 78 to slide therealong is a pulley 7 9 engaged by a belt 80 passed around the pulley 81 on the cutter shaft 67 and received in a recess in the bearing 65.

On the shaft 75, as shown in Fig. 4 is a pinion 82 meshing into a gear wheel 83 on a stub shaft 84- carried by the machine frame, the wheel 83 carrying a pulley 85 engaged by a belt 86 connected with a pulley 87 carried by one endof the lead screw 50.

On the shaft 75 as shown in Fig. 5 is a pulley 88 connected by means of a belt 89 with a pulley 90 on the shaft 45.

The drives are as follows:--From the shaft 75, the pulley 76, the belt 76, the pulley 77 the shaft 78, the pulley 79, the belt 80 and the pulley 81 to the cutter shaft 67 From the shaft 75 through the pinion 82, the gear wheel 83, the pulley 85, the belt 86 and the pulley 87 to the lead screw 50. From the shaft 7 5 through the pulley 88, the belt 89, the pulley 90, the shaft 45, the worm 44, the pinion 43, the shaft 42, the

shaft 38 the worm 39 and the pinion 33 to the spindle 24. From the shaft 38 through the shaft 37, the worm 35 and the worm wheel or pinion 32 into the spindle 12.

Suppose that it is desired to make an inside cut on the material 31. Then the spider 25 is removed from the left hand end of the basket 18 and the block of material 31 is held within the basket by the screws 22. By means of the lever 47 and the clutch 46, the driven spindle 24 is coupled to the hub 23 of the basket 18, and when the spindle 24 is rotated, the basket and the material 31 will be rotated also. By means of the screw 4, the basket carriage 3 is moved toward the front of the machine. This operation brings the cutter 68 opposite to the end face of the material 31 and within the extended peripheral contour of the material. The model 14 is now too close to the front of the machine but through the medium of the feed screw 17, the model carrier 10 may be moved back toward the rear of the machine until the roller 64 cooperates properly with the model 14. When the tool carriage 49 is advanced and when the basket 18 and the material 31 are rotated, a cavity will be formed in the material 31. In order to increase the size of the cavity, that is to decrease the thickness of the wall of the leg, the model carriage 10 is moved toward the front. This operation causes the parts 61 and 66 to assume an acute angle with respect to the center of rotation of the material 31 and in order to obviate this undesirable condition, the basket carriage 3 together with the model carriage 10 are moved toward the rear. Recalling that a micrometric exactness and fidelity to detail is not called for in a wooden leg sufficiently perfect to exercise all the functions of an article of that sort, the utility of the machine herein disclosed, and the operation thereof, will be evident.

Let it be supposed, however, that it is desired to shape the evterior of the article 31.

Then the spider 25 is applied to one end ofthe basket 18 as shown in Fig. 2 and the article 31 is held between. the head 30 on the screw 38 and the end of the spindle 24. By manipulating the clutch 26, the spindle 24 is disconnected from the basket 18 and-the latter will not rotate. Then, the arm 66 will enter between the radiating spokes of the spider 25 and operate properly upon the article 31 which is being rotated, independent of the basket, through the medium of the driven spindle 24.

The tool carriage 49 may be disconnected from the head screw 50 at any time by manipulating the cam ring 53 shown in Fig. 7, to separate the constituent parts of the split nut 52 from the lead screw 50. Thus, the head stock may be adjusted rapidly by hand.

The universal joints 37 and 41, together with the longitudinally extensible shafts 34 and 38 permit the carriages 10 and 3 to have relative transverse movement with respect to each other.

When the cutter 68 is operating upon the outside of the wooden leg 31 and is forming the angle portion of the leg, the arm 66 may at times strike against the calf portion of the leg if the calf is of considerable diameter. Under such circumstances, the base plate 100 may be moved on its pivot 101 through the medium of the screw 104, in order to permit the cutter to operate properly. This horizontal swinging movement of the base plate 101 ordinarily is very slight.

Having thus described the invention, what is claimed is 1. In a device of the class described, superposed work and model carriages; a swinging frame embodying a model-engaging means and a workengaging cutter; means for producing relative movement between the carriages upon the one hand and the frame upon the other hand in the direction of the length of the work; and means for producing relative movement between the carriages in a direction transverse to the work.

2. In a device of theclass described, superposed work and model carriages; a swinging frame embodying a model-engaging means and work-engaging cutter; means for proupon the other hand directionlof the length QfltllG work; and means for moving onecarriage; transversely of the Work.

3. In a device offthe class described, a

supporting structure; aframe and a bedmember mounted to swing thereon in substantially parallel planes, the framecomprising a model-engaging means and a workengaging cutter; meansfor holding the bedmember in ad usted positions; superposed work and modeljcarr ages' mounted to move 7 1 with I respect: to each other transversely of the work,yonecarr1age being mounted to move-on the bed 'm'ember transversely of the work; and" means for moving the ,frame r toward and away"from' the carriages longi- 7 "'4. "In .a deviceof the classdescribed, frame; a basket support on the frame;

tudinally of the work.

model support on the basket support; basket journaled inithe basket support; gcenter'journa-led in the. basket; means for connecting the center with the, basket and 'for'disconne'cting the center from'the basket; means for drivingithe center; a spider deta ch'ably secured to the basket and includ- 7 ingja work holding vcenter; a tool carriage on the frame; a cutter cooperating withthe basket; 'aguide cooperating with the model support; 'meansfor operatively connecting C'opieso'fthis patent may be obtained. for

the cutter and the guide, said means being pivotally mounted on the tool carriage; and means for producing relative movement between the tool carriage on the one hand and the supports upon the other hand and work- 'holding means on the basket, the work-holding means being operative when the spider is removed. g

5. In a'device of the class described, a

basket-carriage; a basket journaled in the carriage; a work-holding device upon the basket; a pair of centers upon the basket, one of which centers is detachable; means for connecting the other center and the basket-carriage for simultaneous rotation; means for rotating said other center; a model-holding means; a cutter operating within the contour of the basket; a cutterdirecting element cooperating with the model-holding means; and means for con necting the cutter and the cutter-d1recting .element for simultaneous swinging movefive cents each, by addressing the Commissioner of Patents, Washington, D. G. 

